> -----Original Message----- > From: Robin Murphy <[email protected]> > Date: Tue, Jun 28, 2016 at 11:18 AM > Subject: [RFC 1/2] iommu/dma: Restrict IOVAs to physical memory layout > To: [email protected], [email protected] > > > Certain peripherals may be bestowed with knowledge of the physical > memory map of the system in which they live, and refuse to handle > addresses that they do not think are memory, which causes issues when > remapping to arbitrary IOVAs. Sidestep the issue by restricting IOVA > domains to only allocate addresses within ranges which match the > physical memory layout. > > Signed-off-by: Robin Murphy <[email protected]> > --- > > Posting this as an RFC because it's something I've been having to use > on Juno for all the PCI IOMMU development - it's pretty horrible, but I > can't easily think of a nicer solution...
Maybe I'm not getting the implications of this looking at the patch in isolation, but how will this impact systems that have devices limited to 32-bit addressing? In our memory map we have physical memory regions at: 0x00_8000_0000 0x80_8000_0000 Will devices with a 32-bit DMA mask still get 32-bit IOVAs? Thanks, Stuart _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
